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QGIS Server has some limitations but you can add Lizmap on top and get more functionalities. The documentation is pretty good but it lacks a good English translation from french. It handles users/groups. Cache management Bing, Google, IGN, OSM base layers You can easily build html popup for getFeatureInfo calls. The Lizmap plugin is very handy and gives ...


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Your map file says you are using epsg:4326 as a projection. Leaflet map uses epsg:3857 as a default (https://github.com/Leaflet/Leaflet/blob/master/src/map/Map.js) you could try passing following option when you create your L.Map object var map = new L.Map('map', { crs: L.CRS.EPSG4326 }); Anyway, your problem is around projections


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Ok, this is not really a GIS related but rather a programming related question. Anyway, for your intended purpose you can use almost any language you like. Here is a very, very simple PHP script based on the example Mapfile from the documentation at http://www.mapserver.org/mapscript/php/by_example.html. In this script only the variable DATA is altered: ...


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Note: Read also the comments below the question because they are more valuable than this answer alone. The right way to go is to use the big image as a single internally tiled tiff file and to create overviews with gdaladdo utility. Read slides 10-13 from http://slideshare.net/geosolutions/geoserver-on-steroids and study the first commands from this thread ...



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